Adaptive Antenna Selection for Interference Mitigation

ABSTRACT

This disclosure relates to perfoming antenna selection to reduce interference in a wireless device. According to some embodiments, it may be determined whether simultaneous communication according to first and second wireless communication technologies causes performance degradation to a third wireless communication technology. If the simultaneous communication according to first and second wireless communication technologies does cause performance degradation to the third wireless communication technology, selection of antenna(s) used for the communications may be based at least in part on the determination that the simultaneous communication according to the first and second wireless communication technologies causes performance degradation to the third wireless communication technology.

FIELD

The present application relates to wireless communications, includingadaptively selecting antennas to reduce interference.

DESCRIPTION OF THE RELATED ART

Wireless communication systems are rapidly growing in usage.Additionally, there exist numerous different wireless communicationtechnologies and standards. Some examples of wireless communicationstandards include GSM, UMTS (associated with, for example, WCDMA orTD-SCDMA air interfaces), LTE, LTE Advanced (LTE-A), HSPA, 3GPP2CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN orWi-Fi), IEEE 802.16 (WiMAX), Bluetooth, Global Navigational SatelliteSystems (e.g., Global Positioning System (GPS), GLONASS, Galileo,BeiDou) and others.

In many instances, a wireless device may implement multiple suchwireless communication technologies. This can lead to potentialinterference problems, for example if communication by one or morewireless communication technologies interferes with communication byanother wireless communication technology operating in the samefrequency band. Furthermore, in some cases, even if signals used bydifferent wireless communication technologies do not occupy similarfrequency bands, intermodulation effects of transmissions by thosewireless communication technologies can interfere with other wirelesscommunication technologies.

SUMMARY

Embodiments are presented herein of apparatuses, systems, and methodsfor performing antenna selection for wireless communication in a mannerthat takes into account intermodulation and other potentiallyperformance degrading effects.

The techniques provided herein may, according to some embodiments,reduce performance degradation to a wireless communication technology,such as a global navigational satellite system (GNSS), caused byintermodulation and/or other interference resulting from transmission byother wireless communication technologies, such as Cellular andWi-Fi/Bluetooth communication technologies.

According to some embodiments, a wireless device may determine whetherthere is potential for (e.g., intermodulation) interference at thewireless device, for example due to transmissions by the wirelessdevice. For example, if certain wireless communication technologies areoperating on transmission frequencies that could produce anintermodulation product in a frequency band that is also used (e.g., byanother wireless communication technology) by the wireless device, theremay be potential for intermodulation interference at the wirelessdevice. If the affected frequency band is not in use (e.g., if thewireless communication technology that could use the affected frequencyband is not active, or is using a different frequency band), thepotential intermodulation interference may not actually occur. However,if the affected frequency band is or may become in use, it may improveperformance to mitigate the intermodulation interference effects.

When there is potential for intermodulation or other interference,antenna selection may be performed in such a manner as to mitigate theinterference. For example, one or more of the antennas used for thetransmissions that could combine to produce intermodulation interferencemay be selected to increase or potentially even provide a maximumpossible isolation with respect to an antenna using (or potentiallyusing) the affected frequency band. This may reduce the impact of theintermodulation interference, as the strength of the intermodulationproduct at the impacted antenna may be reduced as a result of such aproactive antenna selection process.

The techniques described herein may be implemented in and/or used with anumber of different types of devices, including but not limited tocellular phones, tablet computers, wearable computing devices, portablemedia players, and any of various other computing devices.

The mechanisms for mitigating interference described herein may be usedin conjunction with any of various types of interference, including butnot limited to intermodulation or harmonic products, blocking effects,out-of-band noise leakage, etc.

This Summary is intended to provide a brief overview of some of thesubject matter described in this document. Accordingly, it will beappreciated that the above-described features are merely examples andshould not be construed to narrow the scope or spirit of the subjectmatter described herein in any way. Other features, aspects, andadvantages of the subject matter described herein will become apparentfrom the following Detailed Description, Figures, and Claims.

BRIEF DESCRIPTION OF THE DRAWINGS

A better understanding of the present subject matter can be obtainedwhen the following detailed description of the embodiments is consideredin conjunction with the following drawings, in which:

FIGS. 1-2 illustrate exemplary (and simplified) wireless communicationsystems;

FIG. 3 illustrates a block diagram of an exemplary wireless device;

FIG. 4 illustrates a block diagram of an exemplary base station;

FIG. 5 is a flowchart diagram illustrating aspects of an exemplarymethod for performing adaptive antenna selection to reduceintermodulation interference;

FIG. 6 is a block diagram illustrating examples of possible antennalocations of a wireless device; and

FIGS. 7-8 are flowchart diagrams illustrating exemplary possible Wi-Fiantenna selection algorithms that may reduce intermodulationinterference.

While the features described herein may be susceptible to variousmodifications and alternative forms, specific embodiments thereof areshown by way of example in the drawings and are herein described indetail. It should be understood, however, that the drawings and detaileddescription thereto are not intended to be limiting to the particularform disclosed, but on the contrary, the intention is to cover allmodifications, equivalents and alternatives falling within the spiritand scope of the subject matter as defined by the appended claims.

DETAILED DESCRIPTION Terms

The following is a glossary of terms used in this disclosure:

Memory Medium—Any of various types of non-transitory memory devices orstorage devices. The term “memory medium” is intended to include aninstallation medium, e.g., a CD-ROM, floppy disks, or tape device; acomputer system memory or random access memory such as DRAM, DDR RAM,SRAM, EDO RAM, Rambus RAM, etc.; a non-volatile memory such as a Flash,magnetic media, e.g., a hard drive, or optical storage; registers, orother similar types of memory elements, etc. The memory medium mayinclude other types of non-transitory memory as well or combinationsthereof. In addition, the memory medium may be located in a firstcomputer system in which the programs are executed, or may be located ina second different computer system which connects to the first computersystem over a network, such as the Internet. In the latter instance, thesecond computer system may provide program instructions to the firstcomputer for execution. The term “memory medium” may include two or morememory mediums which may reside in different locations, e.g., indifferent computer systems that are connected over a network. The memorymedium may store program instructions (e.g., embodied as computerprograms) that may be executed by one or more processors.

Carrier Medium—a memory medium as described above, as well as a physicaltransmission medium, such as a bus, network, and/or other physicaltransmission medium that conveys signals such as electrical,electromagnetic, or digital signals.

Programmable Hardware Element—includes various hardware devicescomprising multiple programmable function blocks connected via aprogrammable interconnect. Examples include FPGAs (Field ProgrammableGate Arrays), PLDs (Programmable Logic Devices), FPOAs (FieldProgrammable Object Arrays), and CPLDs (Complex PLDs). The programmablefunction blocks may range from fine grained (combinatorial logic or lookup tables) to coarse grained (arithmetic logic units or processorcores). A programmable hardware element may also be referred to as“reconfigurable logic”.

Computer System—any of various types of computing or processing systems,including a personal computer system (PC), mainframe computer system,workstation, network appliance, Internet appliance, personal digitalassistant (PDA), television system, grid computing system, or otherdevice or combinations of devices. In general, the term “computersystem” can be broadly defined to encompass any device (or combinationof devices) having at least one processor that executes instructionsfrom a memory medium.

User Equipment (UE) (or “UE Device”)—any of various types of computersystems devices which are mobile or portable and which performs wirelesscommunications. Examples of UE devices include mobile telephones orsmart phones (e.g., iPhone™, Android™-based phones), portable gamingdevices (e.g., Nintendo DS™, PlayStation Portable™, Gameboy Advance™,iPhone™), wearable devices (e.g., smart watch, smart glasses), laptops,PDAs, portable Internet devices, music players, data storage devices, orother handheld devices, etc. In general, the term “UE” or “UE device”can be broadly defined to encompass any electronic, computing, and/ortelecommunications device (or combination of devices) which is easilytransported by a user and capable of wireless communication.

Base Station—The term “Base Station” has the full breadth of itsordinary meaning, and at least includes a wireless communication stationinstalled at a fixed location and used to communicate as part of awireless telephone system or radio system.

Processing Element—refers to various elements or combinations ofelements. Processing elements include, for example, circuits such as anASIC (Application Specific Integrated Circuit), portions or circuits ofindividual processor cores, entire processor cores, individualprocessors, programmable hardware devices such as a field programmablegate array (FPGA), and/or larger portions of systems that includemultiple processors.

Channel—a medium used to convey information from a sender (transmitter)to a receiver. It should be noted that since characteristics of the term“channel” may differ according to different wireless protocols, the term“channel” as used herein may be considered as being used in a mannerthat is consistent with the standard of the type of device withreference to which the term is used. In some standards, channel widthsmay be variable (e.g., depending on device capability, band conditions,etc.). For example, LTE may support scalable channel bandwidths from 1.4MHz to 20 MHz. In contrast, WLAN channels may be 22 MHz wide whileBluetooth channels may be 1 Mhz wide. Other protocols and standards mayinclude different definitions of channels. Furthermore, some standardsmay define and use multiple types of channels, e.g., different channelsfor uplink or downlink and/or different channels for different uses suchas data, control information, etc.

Band—The term “band” has the full breadth of its ordinary meaning, andat least includes a section of spectrum (e.g., radio frequency spectrum)in which channels are used or set aside for the same purpose.

Automatically—refers to an action or operation performed by a computersystem (e.g., software executed by the computer system) or device (e.g.,circuitry, programmable hardware elements, ASICs, etc.), without userinput directly specifying or performing the action or operation. Thusthe term “automatically” is in contrast to an operation being manuallyperformed or specified by the user, where the user provides input todirectly perform the operation. An automatic procedure may be initiatedby input provided by the user, but the subsequent actions that areperformed “automatically” are not specified by the user, i.e., are notperformed “manually”, where the user specifies each action to perform.For example, a user filling out an electronic form by selecting eachfield and providing input specifying information (e.g., by typinginformation, selecting check boxes, radio selections, etc.) is fillingout the form manually, even though the computer system must update theform in response to the user actions. The form may be automaticallyfilled out by the computer system where the computer system (e.g.,software executing on the computer system) analyzes the fields of theform and fills in the form without any user input specifying the answersto the fields. As indicated above, the user may invoke the automaticfilling of the form, but is not involved in the actual filling of theform (e.g., the user is not manually specifying answers to fields butrather they are being automatically completed). The presentspecification provides various examples of operations beingautomatically performed in response to actions the user has taken.

FIGS. 1 and 2—Communication System

FIG. 1 illustrates an exemplary (and simplified) wireless communicationsystem, according to some embodiments. It is noted that the system ofFIG. 1 is one example of a possible system, and embodiments may beimplemented in any of various systems, as desired.

As shown, the exemplary wireless communication system includes a basestation 102A, which communicates over a transmission medium with one ormore user devices 106A, 106B, etc., through 106N. Each of the userdevices may be referred to herein as a “user equipment” (UE). Thus, theuser devices 106 are referred to as UEs or UE devices.

The base station 102A may be a base transceiver station (BTS) or cellsite, and may include hardware that enables wireless communication withthe UEs 106A through 106N. The base station 102A may also be equipped tocommunicate with a network 100 (e.g., a core network of a cellularservice provider, a telecommunication network such as a public switchedtelephone network (PSTN), and/or the Internet, among variouspossibilities). Thus, the base station 102A may facilitate communicationbetween the user devices and/or between the user devices and the network100.

The communication area (or coverage area) of the base station may bereferred to as a “cell.” The base station 102A and the UEs 106 may beconfigured to communicate over the transmission medium using any ofvarious radio access technologies (RATs), also referred to as wirelesscommunication technologies, or telecommunication standards, such as GSM,UMTS (WCDMA, TD-SCDMA), LTE, LTE-Advanced (LTE-A), 3GPP2 CDMA2000 (e.g.,1xRTT, 1xEV-DO, HRPD, eHRPD), Wi-Fi, WiMAX etc. Additionally, one ormore access points (such as access point 104) may be communicativelycoupled to the network 100. These may include Wi-Fi access pointsconfigured to support cellular network offloading and/or otherwiseprovide wireless communication services as part of the wirelesscommunication system illustrated in FIG. 1.

As a still further (additional or alternative) possibility, in someembodiments multiple UEs may be able to communicate directly, forexample using a peer-to-peer wireless communication technology such asWi-Fi peer-to-peer or Bluetooth, or with one of the UEs acting as aWi-Fi access point. For example, UE 106A and UE 106B are illustrated asbeing in direct communication in FIG. 1.

Base station 102A and other similar base stations (such as base stations102B . . . 102N) and/or access points (such as access point 104)operating according to the same or a different wireless communicationstandard may thus be provided as a network of cells, which may providecontinuous or nearly continuous overlapping service to UEs 106A-N andsimilar devices over a wide geographic area via one or more wirelesscommunication standards.

Thus, while base station 102A may act as a “serving cell” for UEs 106A-Nas illustrated in FIG. 1, each UE 106 may also be capable of receivingsignals from (and possibly within communication range of) one or moreother cells (which might be provided by base stations 102B-N and/or anyother base stations) and/or wireless local area networks (WLANs), whichmay be referred to as “neighboring cells” or “neighboring WLANs” (e.g.,as appropriate), and/or more generally as “neighbors”. Such neighborsmay also be capable of facilitating communication between user devicesand/or between user devices and the network 100. Such neighbors mayinclude “macro” cells, “micro” cells, “pico” cells, “femto” cells,WLANs, and/or cells which provide any of various other granularities ofservice area size. For example, base stations 102A-B illustrated in FIG.1 might provide macro cells, base station 102N might provide a microcell, and access point 104 might be a Wi-Fi AP which provides a WLAN.Note also that in some instances, a UE (such as one of UEs 106A-N) maybe served by multiple neighboring cells (e.g., a serving set), forexample using coordinated multipoint (CoMP) wireless communication.Other configurations are also possible.

At least in some instances, a UE 106 may additionally be capable ofreceiving satellite communication signals. For example, one or more ofthe illustrated UEs 106 may be capable of utilizing one or more globalnavigational satellite systems (GNSS, e.g., GPS or GLONASS), and/or oneor more other satellite-based communication systems.

Thus, a UE 106 may be capable of communicating using multiple wirelesscommunication technologies. For example, a UE 106 might be configured tocommunicate using two or more of GSM, UMTS, CDMA2000, WiMAX, LTE, LTE-A,WLAN, Bluetooth, one or more global navigational satellite systems, oneand/or more mobile television broadcasting standards (e.g., ATSC-M/H orDVB-H), etc. Other combinations of wireless communication technologies(including more than two wireless communication technologies) are alsopossible.

Any or all of the network 100, base stations 102, access points 104,and/or UEs 106 illustrated in FIG. 1 may be configured to implement orsupport implementation of part or all of the methods described herein,including, inter alia, the method of FIG. 5.

FIG. 2 illustrates an exemplary (and simplified) system in which userequipment 106 (e.g., one of the devices 106A through 106N) is capable ofusing (e.g., concurrently and/or at different times) multiple wirelesscommunication technologies. The UE 106 may be any of various types ofdevice, such as a mobile phone, a hand-held device, a computer or atablet, or virtually any type of wireless device.

The UE 106 may include a processor that is configured to execute programinstructions stored in memory. The UE 106 may perform any of the methodembodiments described herein by executing such stored instructions.Alternatively, or in addition, the UE 106 may include a programmablehardware element such as an FPGA (field-programmable gate array) that isconfigured to perform any of the method embodiments described herein, orany portion of any of the method embodiments described herein.

The UE 106 may be configured to communicate using any of multiple radioaccess technologies/wireless communication protocols. As onepossibility, the UE 106 may be configured to communicate using at leastone cellular communication technology, at least one wireless local areanetwork technology, and at least one satellite communication technology.For example, as shown, the UE 106 may be capable of communication withone or more satellites 110 (e.g., according to one or more GNSStechnologies), one or more cellular base stations 102 (e.g., accordingto one or more cellular communication technologies), and/or one or moredevices 108 available via a wireless local area network (e.g., accordingto one or more WLAN technologies). Other combinations of wirelesscommunication technologies are also possible.

The UE 106 may include one or more antennas for communicating using thewireless communication protocols or technologies. In one embodiment, theUE 106 might be configured to communicate using either of CDMA2000(1xRTT/1xEV-DO/HRPD/eHRPD) or LTE using a single shared radio and/or GSMor LTE using the single shared radio. The shared radio may couple to asingle antenna, or may couple to multiple antennas (e.g., for MIMO) forperforming wireless communications. In general, a radio may include anycombination of a baseband processor, analog RF signal processingcircuitry (e.g., including filters, mixers, oscillators, amplifiers,etc.), or digital processing circuitry (e.g., for digital modulation aswell as other digital processing). Similarly, the radio may implementone or more receive and transmit chains using the aforementionedhardware. For example, the UE 106 may share one or more parts of areceive and/or transmit chain between multiple wireless communicationtechnologies, such as those discussed above.

In some embodiments, the UE 106 may include separate transmit and/orreceive chains (e.g., including separate RF and/or digital radiocomponents) for each wireless communication protocol with which it isconfigured to communicate. As a further possibility, the UE 106 mayinclude one or more radios that are shared between multiple wirelesscommunication protocols and one or more radios that are used exclusivelyby a single wireless communication protocol. For example, the UE 106might include a shared radio for communicating using either of LTE and1xRTT (or LTE or GSM), and separate radios for communicating using eachof Wi-Fi and GNSS. Other configurations are also possible.

FIG. 3—Exemplary Block Diagram of a UE

FIG. 3 illustrates an exemplary block diagram of a UE 106, according tosome embodiments. As shown, the UE 106 may include a system on chip(SOC) 300, which may include portions for various purposes. For example,as shown, the SOC 300 may include processor(s) 302, which may executeprogram instructions for the UE 106, and display circuitry 304, whichmay perform graphics processing and provide display signals to thedisplay 360. The processor(s) 302 may also be coupled to memorymanagement unit (MMU) 340, which may be configured to receive addressesfrom the processor(s) 302 and translate those addresses to locations inmemory (e.g., memory 306, read only memory (ROM) 350, NAND flash memory310) and/or to other circuits or devices, such as the display circuitry304, wireless communication circuitry 330, connector I/F 320, and/ordisplay 360. The MMU 340 may be configured to perform memory protectionand page table translation or set up. In some embodiments, the MMU 340may be included as a portion of the processor(s) 302.

As shown, the SOC 300 may be coupled to various other circuits of the UE106. For example, the UE 106 may include various types of memory (e.g.,including NAND flash 310), a connector interface 320 (e.g., for couplingto a computer system, dock, charging station, etc.), the display 360,and wireless communication circuitry (e.g., radio(s)) 330 (e.g., forLTE, Wi-Fi, GPS, etc.).

The UE device 106 may include at least one antenna, and in someembodiments multiple antennas, for performing wireless communicationwith base stations and/or other devices. For example, the UE device 106may use antenna(s) 335 to perform the wireless communication. As notedabove, the UE 106 may be configured to communicate wirelessly usingmultiple wireless communication standards in some embodiments.

As described further subsequently herein, the UE 106 may includehardware and software components for implementing part or all of themethods described herein. The processor(s) 302 of the UE device 106 maybe configured to implement part or all of the methods described herein,e.g., by executing program instructions stored on a memory medium (e.g.,a non-transitory computer-readable memory medium). In other embodiments,processor(s) 302 may be configured as a programmable hardware element,such as an FPGA (Field Programmable Gate Array), or as an ASIC(Application Specific Integrated Circuit). Alternatively (or inaddition) the processor(s) 302 of the UE device 106, in conjunction withone or more of the other components 300, 304, 306, 310, 320, 330, 335,340, 350, 360 may be configured to implement part or all of the featuresdescribed herein.

FIG. 4—Exemplary Block Diagram of a Base Station

FIG. 4 illustrates an exemplary block diagram of a base station 102,according to some embodiments. It is noted that the base station of FIG.4 is merely one example of a possible base station. As shown, the basestation 102 may include processor(s) 404, which may execute programinstructions for the base station 102. The processor(s) 404 may also becoupled to memory management unit (MMU) 440, which may be configured toreceive addresses from the processor(s) 404 and translate thoseaddresses to locations in memory (e.g., memory 460 and read only memory(ROM) 450) or to other circuits or devices.

The base station 102 may include at least one network port 470. Thenetwork port 470 may be configured to couple to a telephone network andprovide a plurality of devices, such as UE devices 106, access to thetelephone network as described above in relation to FIGS. 1 and 2.

The network port 470 (or an additional network port) may also oralternatively be configured to couple to a cellular network, e.g., acore network of a cellular service provider. The core network mayprovide mobility related services and/or other services to a pluralityof devices, such as UE devices 106. In some cases, the network port 470may couple to a telephone network via the core network, and/or the corenetwork may provide a telephone network (e.g., among other UE devicesserviced by the cellular service provider).

The base station 102 may include at least one antenna 434, and possiblymultiple antennas. The antenna(s) 434 may be configured to operate as awireless transceiver and may be further configured to communicate withUE devices 106 via wireless communication circuitry 430. The antenna(s)434 communicates with the wireless communication circuitry 430 viacommunication chain 432. Communication chain 432 may be a receive chain,a transmit chain or both. In some implementations, communication chain432 may include multiple receive chains, multiple transmit chains, orboth. The wireless communication circuitry 430 may be configured tocommunicate via various wireless telecommunication standards, including,but not limited to, LTE, LTE-A, UMTS, CDMA2000, Wi-Fi, etc.

The BS 102 may be configured to communicate wirelessly using multiplewireless communication standards. In some instances, the base station102 may include multiple radios, which may enable the base station 102to communicate according to multiple wireless communicationtechnologies. For example, as one possibility, the base station 102 mayinclude an LTE radio for performing communication according to LTE aswell as a Wi-Fi radio for performing communication according to Wi-Fi.In such a case, the base station 102 may be capable of operating aseither or both of an LTE base station and a Wi-Fi access point. Asanother possibility, the base station 102 may include a multi-moderadio, which is capable of performing communications according to any ofmultiple wireless communication technologies (e.g., LTE and Wi-Fi).

The BS 102 may include hardware and software components for implementingor facilitating implementation of part or all of the methods describedherein. The processor(s) 404 of the base station 102 may be configuredto implement or support implementation of part or all of the methodsdescribed herein, e.g., by executing program instructions stored on amemory medium (e.g., a non-transitory computer-readable memory medium).Alternatively, the processor(s) 404 may be configured as a programmablehardware element, such as an FPGA (Field Programmable Gate Array), or asan ASIC (Application Specific Integrated Circuit), or a combinationthereof. Alternatively (or in addition) the processor(s) 404 of the BS102, in conjunction with one or more of the other components 430, 432,434, 440, 450, 460, 470 may be configured to implement or supportimplementation of part or all of the features described herein.

FIG. 5—Communication Flow Diagram

FIG. 5 is a communication/signal flow diagram illustrating an examplemethod for adaptively performing antenna selection to reduceinterference at a wireless device, according to some embodiments.Aspects of the method of FIG. 5 may be implemented by a wireless devicesuch as UE 106 illustrated in and described with respect to FIGS. 1-3,or more generally in conjunction with any of the computer systems ordevices shown in the above Figures, among other devices, as desired.

In various embodiments, some of the elements of the method shown may beperformed concurrently, in a different order than shown, may besubstituted for by other method elements, or may be omitted. Additionalelements may also be performed as desired. As shown, the method mayoperate as follows.

The wireless device may determine whether an intermodulation product ofits transmissions is in a frequency band also used, at least at sometimes, by the wireless device (502). Note that a frequency band subjectto possible intermodulation interference from such intermodulationproduct(s) may be referred to as a “victim” frequency band herein, atleast in some instances. At least in some embodiments, the determinationmay include determining whether an intermodulation product oftransmissions according to first and second wireless communicationtechnologies falls in a frequency band used by the wireless device forcommunication according to a third wireless communication technology.Note that the wireless communication technologies may include any ofvarious possible wireless communication technologies. As onepossibility, the first wireless communication technology may be awireless local area networking (WLAN) technology (such as Wi-Fi), whilethe second wireless communication technology may be a cellularcommunication technology (such as GSM, UMTS, CDMA2000, LTE, LTE-A,etc.), and the third wireless communication technology may be a globalnavigational satellite system (GNSS) technology (such as GlobalPositioning System (GPS), GLONASS, Galileo, and/or BeiDou). Two of moreof such technologies might be concurrently active, e.g., in a scenarioin which a wireless device uses a cellular data connection to provide amobile Wi-Fi hotspot and also provides GNSS based navigation, forexample while in a motor vehicle, among various other possiblescenarios. As another possibility, cellular and Bluetoothintermodulation could cause interference to GNSS, for example in ascenario in which a wireless device uses a cellular voice connection(e.g., VoLTE) in conjunction with a Bluetooth headset while alsoproviding GNSS based navigation. As a still further possibility, Wi-Fi(e.g., in the 5 GHz band) and Bluetooth intermodulation could causeinterference to GNSS, for example in a scenario in which a wirelessdevice is providing visual GNSS based navigation information over aWi-Fi connection to a vehicle-based display device and also providingaudio GNSS based navigation information to a Bluetooth audio device.Other technologies/combinations of technologies are also possible.

In some embodiments, the wireless device may also or alternativelydetermine that another type of interference, such as interference causedby a harmonic of a communication frequency, falls in a frequency bandalso used by the wireless device. For example, as one possibility, theLTE B13 second harmonic could fall in a GNSS band, such thatcommunication on the LTE band could potentially cause performancedegradation to GNSS communication. An example of such a scenario wouldbe a cellular voice connection (e.g., VoLTE) in conjunction withproviding GNSS based navigation.

At least in some embodiments, determining whether an intermodulation orother product of transmissions by the wireless device according to firstand/or second wireless communication technologies falls in a frequencyband used by the wireless device for communication according to a thirdwireless communication technology may include several aspects. Forexample, the wireless device may determine whether each of the first andsecond wireless communication technology is active, and if so, whichfrequency (or frequencies) is (are) in use by each of the first wirelesscommunication technology and the second wireless communicationtechnology. Such determination of frequencies used in conjunction withthe first and second wireless communication technologies may be at anydesired level of granularity. For example, the frequencies determinedmay be those associated with specific channels (e.g., center frequencyof an LTE channel on which the wireless device is camped and/or of aWi-Fi channel of a Wi-Fi network of which the wireless device is amember) or frequency ranges (e.g., bands) currently associated with thefirst and second wireless communication technologies. As anotherpossibility, in some instances the frequencies determined may bespecific to transmission operations. For example, such determinationmight include determining a frequency for transmitting according to thefirst wireless communication technology (a “first transmissionfrequency”) and determining a frequency for transmitting according tothe second wireless communication technology (a “second transmissionfrequency”).

Based on the frequencies being used for the first and second wirelesscommunication technologies, it may be possible to determine any possibleintermodulation products, harmonics, or other products that might begenerated by the use of those frequencies. This may include calculatingpossible intermodulation products using one or more formulas based onthe transmission frequencies of the first and second wirelesscommunication technologies, referring to a look-up table in whichintermodulation products associated with certain transmission frequencycombinations and/or harmonics associated with certain transmissionfrequencies are indicated, or any of various other possible techniquesfor determining possible interference.

Once the possible product(s) of communications according to the firstand second wireless communication technologies have been determined, itmay be possible to determine whether any such product(s) might interferewith communication according to the third wireless communicationtechnology. For example, the third wireless communication technology mayoperate in one or more frequency bands, and it may be possible tocompare the frequencies of each determined intermodulation, harmonic, orother product(s) with the frequency band(s) used by the third wirelesscommunication technology. Such a comparision may be performed using anydesired level of granularity, potentially including determining whethera specific frequency of a product matches a specific frequency channelused (currently or in general) by the third wireless communicationtechnology, determining whether there is overlap between a range offrequencies of possible products and a frequency band used (currently orin general) by the third wireless communication technology, and/or usingany of various possible granularities for comparing frequencies.

Note that it may also be possible for the wireless device to determinewhether a product of transmissions according to first and/or secondwireless communication technologies is in a frequency band used by athird wireless communication technology without directly comparingfrequencies of products with frequencies used by the third communicationtechnology. For example, as previously noted, a look-up table may beused in conjunction with individual frequencies and/or frequencycombinations of the first and/or second wireless communicationtechnologies. If desired, such a look-up table could directly indicatethat certain transmission frequencies and/or transmission frequencycombinations may potentially result in interference to the thirdwireless communication technology, e.g., in addition to or instead ofproviding an indication of the intermodulation, harmonic, etc. productsof those transmission frequencies and frequency combinations. Other suchtechniques are also possible.

At least in some embodiments, it may also be determined if the thirdwireless communication technology is active, and/or more generally ifthe victim frequency band is currently being used by the wireless device(504). For example, it may be determined if a module providingfunctionality according to the third wireless communication technologyis active, and/or more specifically to determine a frequency and/orfrequency band currently being used to communicate according to thethird wireless communication technology.

Based at least in part on determining whether interference due tocommunication by the wireless device may be in a frequency band used bythe wireless device, the wireless device may perform antenna selectionfor the communication (506). Such antenna selection may also possibly bebased at least in part on determining whether the victim frequency bandis currently being used by the wireless device (such as by determiningif a wireless communication technology that uses that frequency band isactive), however, it should be noted that antenna selection may beimpacted by the determination of whether any intermodulation and/orharmonic products have the potential to cause interference even if noinformation is collected or available regarding whether the frequency orfrequencies that might be affected by such interference are activelybeing used, if desired. For example, it may be possible (e.g., forimplementation simplicity) to implement interference mitigating antennaselection techniques even without specific knowledge of whether apotential victim frequency band is currently in use.

Antenna selection may include selecting one or more antennas fortransmitting according to the first wireless communication technologyand/or selecting one or more antennas for transmitting according to thesecond wireless communication technology. As one possibility, antennaselection may be performed in a first manner if no potentiallyinterfering products fall in a frequency band used by the wirelessdevice, and in a second manner if a potentially interfering product doesfall in a frequency band used by the wireless device. As anotherpossibility, antenna selection may be performed in a first manner if nopotentially interfering products fall in a frequency band used by thethird wireless communication technology or if the third wirelesscommunication technology is not currently active, and in a second mannerif a potentially interfering product falls in a frequency band used bythe third wireless communication technology and if the third wirelesscommunication technology is currently active.

The first manner of antenna selection (e.g., the antenna selectionprocess when there is not potential for interference) may includeselecting antennas for transmitting according to the first and secondwireless communication technology without regard for reducing ormitigating the interference effects of those transmissions. In at leastsome instances, this may include selecting a multi-antenna mode,selecting an antenna or antennas with good signal strength and/orquality characteristics in current conditions, and/or otherwiseimproving performance (e.g., throughput, latency, power consumption) ofthe first and second wireless communication technologies.

The second manner of antenna selection (e.g., the antenna selectionprocess when there is potential for interference) may include selectingantennas for transmitting according to the first and second wirelesscommunication technology in a manner that similarly includes performancerelated considerations associated with the first and second wirelesscommunication technologies, but may further include considerations forreducing/mitigating the interference effects of those transmissions.This may include switching one or both of the first and second wirelesscommunication technologies from multi-antenna modes to single-antennamodes (e.g., if not already in single antenna mode), as one possibility.As another possibility, this may include selecting an antenna for atleast one of the first and second wireless communication technologiesthat provides increased isolation to an antenna (or antennas) used bythe third wireless communication technology. Note that the antenna(s)that provide the most isolation may depend on the architecture of thewireless device, for example depending on the total number of antennas,distance between antennas, antenna polarization, device materials andtheir properties, etc. In some instances, the second manner of antennaselection may include consideration of which antenna combinations reduceor minimize an amount of receiver desensitization to the third wirelesscommunication technology, and such an antenna combination may beselected.

Once antenna selection is complete, the wireless device may transmitsignals according to the first and second wireless communicationtechnologies using the selected antennas. Since the antenna selectionprocess may be biased to reduce/mitigate interference to the thirdwireless communication technology when there is potential for suchinterference, the amount of such interference caused by the mixingproduct(s) of such transmissions may be reduced, e.g., in relation toother possible antenna combinations.

FIGS. 6-8—Additional Information

FIGS. 6-8 and the information provided herein below in conjunctiontherewith are provided by way of example of various considerations anddetails relating to possible systems in which the method of FIG. 5and/or other aspects of this disclosure may be implemented, and are notintended to be limiting to the disclosure as a whole. Numerousvariations and alternatives to the details provided herein below arepossible and should be considered within the scope of the disclosure.

In a wireless device with cellular, Wi-Fi, and GNSS communicationcapability, it is possible that when both cellular and Wi-Fi antennasare transmitting simultaneously, certain cellular and Wi-Fi bandcombinations may cause intermodulation products to fall into the GNSSband and degrade GNSS performance. For example, a scenario might occurin which a cellular transmission is being performed at 851.6 MHz (e.g.,LTE B20 Ch24346) and a Wi-Fi transmission is being performed at 2427 MHz(e.g., Wi-Fi Channel 4). One intermodulation product resulting from suchtransmissions may include 1575.4 MHz (Wi-Fi Tx−CellTx=2427−851.6=1575.4), which may affect GPS communications occurring at1575.42 MHz. As another example, a scenario might occur in which acellular transmission is being performed at 1872.3 MHz (e.g., LTE B2Ch18823) and a Wi-Fi transmission is being performed at 5320 MHz (e.g.,Wi-Fi Channel 64). One intermodulation product resulting from suchtransmissions may include 1575.4 MHz (Wi-Fi Tx−2*CellTx=5320−2*(1872.3)=1575.4), which may affect GPS communicationsoccurring at 1575.42 MHz.

The isolation between the cellular, Wi-Fi, and GNSS antennas may be akey factor in determining the amount of performance degradation a GNSSreceiver will suffer in such scenarios. For example, poor isolation mayresult in worse GNSS performance.

FIG. 6 is a block diagram illustrating an example of possible antennalocations within a multi-radio device 602. In the illustrated example,the wireless device 602 includes one GNSS antenna 604, two Wi-Fiantennas 606, 608, and two cellular antennas 610, 612.

In such a system with multiple cellular and Wi-Fi antennas (e.g., adevice capable of Wi-Fi MIMO), certain antennas may have betterisolation than others. In the illustrated example, Wi-Fi antenna 606 hasrelatively poor isolation while Wi-Fi antenna 608 has relatively goodisolation. Thus, under circumstances in which there is potential forintermodulation interference or other interference effects to affectreception of GNSS communications, it may reduce such interference toselect Wi-Fi and/or cellular antennas that provide greater isolation,potentially including switching to SISO mode if not already soconfigured.

Accordingly, FIGS. 7 and 8 are flowchart diagrams illustrating exemplaryWi-Fi antenna selection algorithms for a wireless device with Wi-Fiactive to reduce interference to GNSS when GNSS activity information isavailable and when GNSS activity information is not availablerespectively.

According to the method of FIG. 7, as shown, it may be determined if acellular radio of the wireless device is active (702). If the cellularradio of the wireless device is active, it may be determined if thecombination of Wi-Fi and cellular bands used combine in a way thatdegrades GNSS performance (704). If the combination of Wi-Fi andcellular transmit frequencies does generate an IMD product in a GNSSband, it may be determined if a GNSS radio of the wireless device isactive (706). If the GNSS radio of the wireless device is active, thewireless device may apply IMD interference mitigation considerations tothe Wi-Fi antenna selection, potentially including switching Wi-Fi tosingle antenna transmit mode (e.g., if applicable) and/or selecting aWi-Fi transmit antenna that reduces or minimizes GNSS performancedegradation (708). If the cellular radio of the wireless device is notactive, or if the combination of Wi-Fi and cellular transmit frequenciesdoes not generate an IMD product in a GNSS band, or if the GNSS radio ofthe wireless device is not active, the wireless device may continue itsnormal Wi-Fi operation, potentially including using MIMO communicationtechniques (710).

According to the method of FIG. 8, as shown, it may be determined if acellular radio of the wireless device is active (802). If the cellularradio of the wireless device is active, it may be determined if thecombination of Wi-Fi and cellular bands used combine in a way thatdegrades GNSS performance (804). If the combination of Wi-Fi andcellular transmit frequencies does generate an IMD product in a GNSSband, the wireless device may apply IMD interference mitigationconsiderations to the Wi-Fi antenna selection, potentially includingswitching Wi-Fi to single antenna transmit mode (e.g., if applicable)and/or selecting a Wi-Fi transmit antenna that reduces or minimizes GNSSperformance degradation (806). If the cellular radio of the wirelessdevice is not active, or if the combination of Wi-Fi and cellulartransmit frequencies does not generate an IMD product in a GNSS band,the wireless device may continue its normal Wi-Fi operation, potentiallyincluding using MIMO communication techniques (808).

Note that while FIGS. 7 and 8 relate to Wi-Fi antenna selection, asimilar algorithm for performing cellular antenna selection could alsoor alternatively be implemented, and/or an algorithm that encompassesboth cellular and Wi-Fi antenna selection could be implemented, ifdesired. In fact, if multiple antennas are being used for GNSSreception, an algorithm that encompasses cellular, Wi-Fi and GNSSantenna selection could be implemented if desired.

By performing antenna selection in such a manner that interference ismitigated (e.g., by selecting an antenna combination with good isolationwhenever there is potential for intermodulation inteference), themaximum possible jammer noise density to be expected by GNSS mayeffectively be reduced. This may in turn allow the GNSS block to use alower (and potentially more accurate) jammer noise density estimate insuch scenarios, which may further improve GNSS performance, at least insome embodiments.

In the following further exemplary embodiments are provided.

One set of embodiments may include an apparatus, comprising: aprocessing element; wherein the processing element is configured to:determine that an intermodulation product of transmissions according tofirst and second wireless communication technologies is in a frequencyband used by a third wireless communication technology; and select oneor more antennas used for the transmissions according to the first andsecond wireless communication technologies based at least in part ondetermining that an intermodulation product of the transmissionsaccording to the first and second wireless communication technologies isin a frequency band used by the third wireless communication technology.According to some embodiments, the processing element is furtherconfigured to: determine whether the third wireless communicationtechnology is active; and select the one or more antennas used for thetransmissions according to the first and second wireless communicationtechnologies based at least in part on determining that anintermodulation product of the transmissions according to the first andsecond wireless communication technologies is in a frequency band usedby the third wireless communication technology if the third wirelesscommunication technology is active, wherein selecting the one or moreantennas used for the transmissions according to the first and secondwireless communication technologies is not affected by determining thatan intermodulation product of the transmissions according to the firstand second wireless communication technologies is in a frequency bandused by the third wireless communication technology if the thirdwireless communication technology is not active.

According to some embodiments, the first wireless communicationtechnology is a wireless local area networking (WLAN) technology, thesecond wireless communication technology is a cellular communicationtechnology, and the third wireless communication technology is a globalnavigational satellite system (GNSS) technology).

According to some embodiments, to select one or more antennas used forthe transmissions according to the first and second wirelesscommunication technologies based at least in part on determining that anintermodulation product of the transmissions according to the first andsecond wireless communication technologies is in a frequency band usedby the third wireless communication technology, the processing elementis further configured to: select the one or more antennas used for thetransmissions according to the first and second wireless communicationtechnologies to reduce performance degradation to the third wirelesscommunication technology caused by the intermodulation product.

According to some embodiments, to select one or more antennas used forthe transmissions according to the first and second wirelesscommunication technologies based at least in part on determining that anintermodulation product of the transmissions according to the first andsecond wireless communication technologies is in a frequency band usedby the third wireless communication technology, the processing elementis further configured to: select the one or more antennas used for thetransmissions according to the first and second wireless communicationtechnologies to provide increased isolation for an antenna used by thethird wireless communication technology.

According to some embodiments, to select one or more antennas used forthe transmissions according to the first and second wirelesscommunication technologies based at least in part on determining that anintermodulation product of the transmissions according to the first andsecond wireless communication technologies is in a frequency band usedby the third wireless communication technology, the processing elementis further configured to: switch at least one of the first wirelesscommunication technology or the second wireless communication technologyfrom a multi-antenna communication mode to a single-antennacommunication mode.

An additional exemplary set of embodiments may include a wireless userequipment (UE) device, comprising: a plurality of antennas; one or moreradios coupled to the plurality of antennas; and a processing elementoperably coupled to the one or more radios; wherein the UE device isconfigured to: determine whether an intermodulation product of cellularand Wi-Fi communication by the UE device is in a frequency band used bythe UE device for global navigational satellite system (GNSS)communication; select one or more antennas for one or more of cellularor Wi-Fi communication by the UE device based at least in part ondetermining whether an intermodulation product of cellular and Wi-Ficommunication by the UE device is in a frequency band used by the UEdevice for GNSS communication; and transmit Wi-Fi signals and cellularsignals using the selected one or more antennas.

According to some embodiments, the UE device is further configured to:select the one or more antennas for one or more of cellular or Wi-Ficommunication in a first manner if no intermodulation product ofcellular and Wi-Fi communication by the UE device is in a frequency bandused by the UE device for GNSS communication; and select the one or moreantennas for one or more of cellular or Wi-Fi communication in a secondmanner if an intermodulation product of cellular and Wi-Fi communicationby the UE device is in a frequency band used by the UE device for GNSScommunication.

According to some embodiments, the UE device is further configured to:determine whether a GNSS module of the UE device is active; whereinselecting the one or more antennas for one or more of cellular or Wi-Ficommunication by the UE device is further based at least in part ondetermining whether a GNSS module of the UE device is active.

According to some embodiments, the UE device is further configured to:select the one or more antennas for one or more of cellular or Wi-Ficommunication in a first manner if no intermodulation product ofcellular and Wi-Fi communication by the UE device is in a frequency bandused by the UE device for GNSS communication or if no GNSS module of theUE device is active; and select the one or more antennas for one or moreof cellular or Wi-Fi communication in a second manner if anintermodulation product of cellular and Wi-Fi communication by the UEdevice is in a frequency band used by the UE device for GNSScommunication and a GNSS module of the UE device is active.

According to some embodiments, to select the one or more antennas forone or more of cellular or Wi-Fi communication by the UE device in thesecond manner, the UE device is further configured to: select a singleantenna mode for Wi-Fi communication; and select an antenna for Wi-Ficommunication with greatest isolation from a GNSS antenna.

According to some embodiments, to determine whether an intermodulationproduct of cellular and Wi-Fi communication by the UE device is in afrequency band used by the UE device for GNSS communication, the UEdevice is configured use one or more of: a lookup table indicatingintermodulation products of selected frequency combinations; or one ormore formulas for calculating intermodulation products of frequencycombinations.

According to some embodiments, the UE device is further configured to:select an antenna combination that causes a lowest amount of receiverdesensitization to GNSS communication among possible antennacombinations if it is determined that an intermodulation product ofcellular and Wi-Fi communication is in a frequency band used by the UEdevice for GNSS communication.

A further set of exemplary embodiments may include a non-transitorycomputer accessible memory medium comprising program instructions that,when executed by a wireless user equipment (UE) device, cause the UEdevice to: determine a first transmission frequency for transmittingaccording to a first wireless communication technology; determine asecond transmission frequency for transmitting according to a secondwireless communication technology; calculate one or more intermodulationproducts of the first transmission frequency and the second transmissionfrequency; determine whether any of the one or more intermodulationproducts are in a frequency band associated with a third wirelesscommunication technology; determine an activity status of the thirdwireless communication technology; perform antenna selection fortransmitting signals according to at least one of the first wirelesscommunication technology or the second wireless communication technologyto reduce interference to the third wireless communication technologyfrom the one or more intermodulation products if the third wirelesscommunication technology is active and the one or more intermodulationproducts are in a frequency band associated with the third wirelesscommunication technology.

According to some embodiments, to perform antenna selection to reduceinterference to the third wireless communication technology from the oneor more intermodulation products, the program instructions further causethe UE device to: switch from a multi-antenna transmission mode to asingle-antenna transmission mode for at least one of the first wirelesscommunication technology or the second wireless communicationtechnology.

According to some embodiments, to perform antenna selection to reduceinterference to the third wireless communication technology from the oneor more intermodulation products, the program instructions further causethe UE device to: select a transmission antenna for at least one of thefirst wireless communication technology or the second wirelesscommunication technology that provides increased isolation to an antennaused to receive signals according to the third wireless communicationtechnology.

According to some embodiments, the first transmission frequency isassociated with a frequency channel associated with the first wirelesscommunication technology, and the second transmission frequency isassociated with a frequency channel associated with the second wirelesscommunication technology.

According to some embodiments, the first wireless communicationtechnology is Wi-Fi, wherein to perform antenna selection to reduceinterference to the third wireless communication technology from the oneor more intermodulation products, the program instructions further causethe UE device to: switch Wi-Fi from multiple input multiple output(MIMO) mode to single output single input (SISO) mode; and select aWi-Fi antenna among a plurality of available Wi-Fi antennas thatprovides greatest isolation to an antenna used to receive signalsaccording to the third wireless communication technology.

According to some embodiments, the program instructions further causethe UE device to: perform antenna selection for transmitting signalsaccording to the first wireless communication technology and the secondwireless communication technology without regard to reducinginterference to the third wireless communication technology from the oneor more intermodulation products if none of the one or moreintermodulation products are in a frequency band associated with thethird wireless communication technology.

According to some embodiments, the program instructions further causethe UE device to: perform antenna selection for transmitting signalsaccording to the first wireless communication technology and the secondwireless communication technology without regard to reducinginterference to the third wireless communication technology from the oneor more intermodulation products if the third wireless communicationtechnology is not active.

Embodiments of the present disclosure may be realized in any of variousforms. For example some embodiments may be realized as acomputer-implemented method, a computer-readable memory medium, or acomputer system. Other embodiments may be realized using one or morecustom-designed hardware devices such as ASICs. Still other embodimentsmay be realized using one or more programmable hardware elements such asFPGAs.

In some embodiments, a non-transitory computer-readable memory mediummay be configured so that it stores program instructions and/or data,where the program instructions, if executed by a computer system, causethe computer system to perform a method, e.g., any of a methodembodiments described herein, or, any combination of the methodembodiments described herein, or, any subset of any of the methodembodiments described herein, or, any combination of such subsets.

In some embodiments, a device (e.g., a UE 106) may be configured toinclude a processor (or a set of processors) and a memory medium, wherethe memory medium stores program instructions, where the processor isconfigured to read and execute the program instructions from the memorymedium, where the program instructions are executable to implement anyof the various method embodiments described herein (or, any combinationof the method embodiments described herein, or, any subset of any of themethod embodiments described herein, or, any combination of suchsubsets). The device may be realized in any of various forms.

Although the embodiments above have been described in considerabledetail, numerous variations and modifications will become apparent tothose skilled in the art once the above disclosure is fully appreciated.It is intended that the following claims be interpreted to embrace allsuch variations and modifications.

1. An apparatus, comprising: a processing element configured to:determine that simultaneous communication of a first wirelesscommunication technology and a second wireless communication technologycauses performance degradation to a third wireless communicationtechnology; and select one or more antennas used for the simultaneouscommunication of the first wireless communication technology and thesecond wireless communication technology based at least in part ondetermining that the simultaneous communication of the first wirelesscommunication technology and the second wireless communicationtechnology causes performance degradation to the third wirelesscommunication technology.
 2. The apparatus of claim 1, wherein theprocessing element is further configured to: determine that the thirdwireless communication technology is active; and select the one or moreantennas used for the simultaneous communication of the first wirelesscommunication technology and the second wireless communicationtechnology based at least in part on determining that the simultaneouscommunication of the first wireless communication technology and thesecond wireless communication technology causes performance degradationto the third wireless communication technology when the third wirelesscommunication technology is active.
 3. The apparatus of claim 1, whereinthe first wireless communication technology comprises a wireless localarea networking (WLAN) technology, wherein the second wirelesscommunication technology comprises a cellular communication technology,wherein the third wireless communication technology comprises a globalnavigational satellite system (GNSS) technology).
 4. The apparatus ofclaim 1, wherein to select one or more antennas used for thesimultaneous communication of the first wireless communicationtechnology and the second wireless communication technology based atleast in part on determining that the simultaneous communication of thefirst wireless communication technology and the second wirelesscommunication technology causes performance degradation to the thirdwireless communication technology, the processing element is furtherconfigured to: select the one or more antennas used for the simultaneouscommunication of the first wireless communication technology and thesecond wireless communication technology to reduce performancedegradation with respect to the third wireless communication technology.5. The apparatus of claim 1, wherein to select one or more antennas usedfor the simultaneous communication of the first wireless communicationtechnology and the second wireless communication technology based atleast in part on determining that the simultaneous communication thefirst wireless communication technology and the second wirelesscommunication technology causes performance degradation to the thirdwireless communication technology, the processing element is furtherconfigured to: select the one or more antennas used for the simultaneouscommunication of the first wireless communication technology and thesecond wireless communication technology to provide increased isolationfor an antenna used by the third wireless communication technology. 6.The apparatus of claim 1, wherein to select one or more antennas usedfor the simultaneous communication of the first wireless communicationtechnology and the second wireless communication technology based atleast in part on determining that the simultaneous communication of thefirst wireless communication technology and the second wirelesscommunication technology causes performance degradation to the thirdwireless communication technology, the processing element is furtherconfigured to: switch at least one of the first wireless communicationtechnology or the second wireless communication technology from amulti-antenna communication mode to a single-antenna communication mode.7. A wireless user equipment (UE) device, comprising: a plurality ofantennas; one or more radios coupled to the plurality of antennas; and aprocessing element operably coupled to the one or more radios; whereinthe UE device is configured to: determine whether an intermodulationproduct of cellular and Wi-Fi communication by the UE device is in afrequency band used by the UE device for global navigational satellitesystem (GNSS) communication; select one or more antennas for one or moreof cellular or Wi-Fi communication by the UE device based at least inpart on determining whether an intermodulation product of cellular andWi-Fi communication by the UE device is in a frequency band used by theUE device for GNSS communication; and transmit Wi-Fi signals andcellular signals using the selected one or more antennas.
 8. The UEdevice of claim 7, wherein the UE device is further configured to:select the one or more antennas for one or more of cellular or Wi-Ficommunication in a first manner if no intermodulation product ofcellular and Wi-Fi communication by the UE device is in a frequency bandused by the UE device for GNSS communication; and select the one or moreantennas for one or more of cellular or Wi-Fi communication in a secondmanner if an intermodulation product of cellular and Wi-Fi communicationby the UE device is in a frequency band used by the UE device for GNSScommunication.
 9. The UE device of claim 7, wherein the UE device isfurther configured to: determine whether a GNSS module of the UE deviceis active; wherein selecting the one or more antennas for one or more ofcellular or Wi-Fi communication by the UE device is further based atleast in part on determining whether a GNSS module of the UE device isactive.
 10. The UE device of claim 9, wherein the UE device is furtherconfigured to: select the one or more antennas for one or more ofcellular or Wi-Fi communication in a first manner if no intermodulationproduct of cellular and Wi-Fi communication by the UE device is in afrequency band used by the UE device for GNSS communication or if noGNSS module of the UE device is active; and select the one or moreantennas for one or more of cellular or Wi-Fi communication in a secondmanner if an intermodulation product of cellular and Wi-Fi communicationby the UE device is in a frequency band used by the UE device for GNSScommunication and a GNSS module of the UE device is active.
 11. The UEdevice of claim 10, wherein to select the one or more antennas for oneor more of cellular or Wi-Fi communication by the UE device in thesecond manner, the UE device is further configured to: select a singleantenna mode for Wi-Fi communication; and select an antenna for Wi-Ficommunication with greatest isolation from a GNSS antenna.
 12. The UEdevice of claim 7, wherein to determine whether an intermodulationproduct of cellular and Wi-Fi communication by the UE device is in afrequency band used by the UE device for GNSS communication, the UEdevice is configured use one or more of: a lookup table indicatingintermodulation products of selected frequency combinations; or one ormore formulas for calculating intermodulation products of frequencycombinations.
 13. The UE device of claim 7, wherein the UE device isfurther configured to: select an antenna combination that causes alowest amount of receiver desensitization to GNSS communication amongpossible antenna combinations if it is determined that anintermodulation product of cellular and Wi-Fi communication is in afrequency band used by the UE device for GNSS communication.
 14. Anon-transitory computer accessible memory medium comprising programinstructions that, when executed by a wireless user equipment (UE)device, cause the UE device to: determine a first transmission frequencyfor transmitting according to a first wireless communication technology;determine a second transmission frequency for transmitting according toa second wireless communication technology; determine one or morefrequencies on which interference is generated from simultaneouslytransmitting on the first transmission frequency and the secondtransmission frequency; determine whether any of the one or morefrequencies on which interference is generated at least partiallyoverlap a frequency band associated with a third wireless communicationtechnology; determine an activity status of the third wirelesscommunication technology; perform antenna selection for transmittingsignals according to at least one of the first wireless communicationtechnology or the second wireless communication technology to reduceinterference to the third wireless communication technology if the thirdwireless communication technology is active and the one or morefrequencies on which interference is generated at least partiallyoverlap a frequency band associated with the third wirelesscommunication technology.
 15. The memory medium of claim 14, wherein toperform antenna selection to reduce interference to the third wirelesscommunication technology, the program instructions further cause the UEdevice to: switch from a multi-antenna transmission mode to asingle-antenna transmission mode for at least one of the first wirelesscommunication technology or the second wireless communicationtechnology.
 16. The memory medium of claim 14, wherein to performantenna selection to reduce interference to the third wirelesscommunication technology, the program instructions further cause the UEdevice to: select a transmission antenna for at least one of the firstwireless communication technology or the second wireless communicationtechnology that provides increased isolation to an antenna used toreceive signals according to the third wireless communicationtechnology.
 17. The memory medium of claim 14, wherein the firsttransmission frequency is associated with a frequency channel associatedwith the first wireless communication technology, wherein the secondtransmission frequency is associated with a frequency channel associatedwith the second wireless communication technology.
 18. The memory mediumof claim 14, wherein the first wireless communication technology isWi-Fi, wherein to perform antenna selection to reduce interference tothe third wireless communication technology, the program instructionsfurther cause the UE device to: switch Wi-Fi from multiple inputmultiple output (MIMO) mode to single output single input (SISO) mode;and select a Wi-Fi antenna among a plurality of available Wi-Fi antennasthat provides greatest isolation to an antenna used to receive signalsaccording to the third wireless communication technology.
 19. The memorymedium of claim 14, wherein the program instructions further cause theUE device to: perform antenna selection for transmitting signalsaccording to the first wireless communication technology and the secondwireless communication technology without regard to reducinginterference to the third wireless communication technology if none ofthe one or more frequencies on which interference is generated overlap afrequency band associated with the third wireless communicationtechnology.
 20. The memory medium of claim 14, wherein the programinstructions further cause the UE device to: perform antenna selectionfor transmitting signals according to the first wireless communicationtechnology and the second wireless communication technology withoutregard to reducing interference to the third wireless communicationtechnology if the third wireless communication technology is not active.